{"id":16671,"date":"2024-09-20T11:47:56","date_gmt":"2024-09-20T14:47:56","guid":{"rendered":"https:\/\/xequematenem.com.br\/blog\/?p=16671"},"modified":"2024-09-20T11:47:58","modified_gmt":"2024-09-20T14:47:58","slug":"questao-106-enem-2019","status":"publish","type":"post","link":"https:\/\/xequematenem.com.br\/blog\/questao-106-enem-2019\/","title":{"rendered":"Quest\u00e3o 106 -ENEM 2019"},"content":{"rendered":"\n<p>Slackline \u00e9 um esporte no qual o atleta deve se equilibrar e executar manobras estando sobre uma fita esticada. Para a pr\u00e1tica do esporte, as duas extremidades da fita s\u00e3o fixadas de forma que ela fique a alguns cent\u00edmetros do solo. Quando uma atleta de massa igual a 80 kg est\u00e1 exatamente no meio da fita, essa se desloca verticalmente, formando um \u00e2ngulo de 10\u00b0 com a horizontal, como esquematizado na figura. Sabe-se que a acelera\u00e7\u00e3o da gravidade \u00e9 igual a 10 ms<sup>-2<\/sup>, cos(10\u00b0) = 0,98 e sen(10\u00b0) = 0,17.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"342\" height=\"159\" src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-496.png\" alt=\"\" class=\"wp-image-16672\" title=\"\" srcset=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-496.png 342w, https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-496-300x139.png 300w\" sizes=\"(max-width: 342px) 100vw, 342px\" \/><\/figure>\n\n\n\n<p>Qual \u00e9 a for\u00e7a que a fita exerce em cada uma das \u00e1rvores por causa da presen\u00e7a da atleta? A) 4,0 \u00d7 10<sup>2<\/sup> N<\/p>\n\n\n\n<p>B) 4,1 \u00d7 10<sup>2 <\/sup>N&nbsp;<\/p>\n\n\n\n<p>C) 8,0 \u00d7 10<sup>2<\/sup>N&nbsp;<\/p>\n\n\n\n<p>D) 2,4 \u00d7 10<sup>3<\/sup> N&nbsp;<\/p>\n\n\n\n<p>E) 4,7 \u00d7 10<sup>3 <\/sup>N<\/p>\n\n\n\n<p class=\"has-text-align-center has-large-font-size\"><strong>Solu\u00e7\u00e3o<\/strong><\/p>\n\n\n\n<p>A for\u00e7a que a fita exerce em uma \u00e1rvore \u00e9 a mesma que ela exerce na outra, com Tens\u00e3o T.&nbsp; No equil\u00edbrio, a for\u00e7a normal N deve se igualar \u00e0 for\u00e7a peso P.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"138\" height=\"32\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-497.png\" alt=\"\" class=\"wp-image-16673 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 138px; --smush-placeholder-aspect-ratio: 138\/32;\"><\/figure>\n\n\n\n<p>Nesse caso, N e P est\u00e3o paralelos, logo&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"62\" height=\"37\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-498.png\" alt=\"\" class=\"wp-image-16674 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 62px; --smush-placeholder-aspect-ratio: 62\/37;\"><\/figure>\n\n\n\n<p>Mas N \u00e9 a proje\u00e7\u00e3o Vertical T<sub>y<\/sub> das for\u00e7as T.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" data-src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfG52lFGekz-Ajl34owXx-hUiTS3noB7l_aTmlzqyurKFtyT1iptyXF1qiYs5tlNb5j5jm73LvTZ8L9eu5LQ8egFfNFscMXH4gF0lvSVAy7W7iwFrxeGWARSbMsSGgirheukKW3R1vsQlnvUM44hxeJkelu?key=cZZoT8Y6vO0sxb39wzql9g\" alt=\"\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" class=\"lazyload\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"180\" height=\"149\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-499.png\" alt=\"\" class=\"wp-image-16675 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 180px; --smush-placeholder-aspect-ratio: 180\/149;\"><\/figure>\n\n\n\n<p>sendo P=mg. Portanto<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"277\" height=\"107\" data-src=\"https:\/\/xequematenem.com.br\/blog\/wp-content\/uploads\/2024\/09\/image-500.png\" alt=\"\" class=\"wp-image-16676 lazyload\" title=\"\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 277px; --smush-placeholder-aspect-ratio: 277\/107;\"><\/figure>\n\n\n\n<p><strong>Alternativa D<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Slackline \u00e9 um esporte no qual o atleta deve se equilibrar e executar manobras estando sobre uma fita esticada. Para a pr\u00e1tica do esporte, as duas extremidades da fita s\u00e3o fixadas de forma que ela fique a alguns cent\u00edmetros do solo. Quando uma atleta de massa igual a 80 kg est\u00e1 exatamente no meio da [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":16672,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17,19],"tags":[],"area-do-conhecimento":[116,121],"assunto":[],"class_list":["post-16671","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-questoes-do-enem","category-19","area-do-conhecimento-ciencias-da-natureza-e-suas-tecnologias","area-do-conhecimento-fisica"],"_links":{"self":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16671","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/comments?post=16671"}],"version-history":[{"count":1,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16671\/revisions"}],"predecessor-version":[{"id":16677,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/posts\/16671\/revisions\/16677"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media\/16672"}],"wp:attachment":[{"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/media?parent=16671"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/categories?post=16671"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/tags?post=16671"},{"taxonomy":"area-do-conhecimento","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/area-do-conhecimento?post=16671"},{"taxonomy":"assunto","embeddable":true,"href":"https:\/\/xequematenem.com.br\/blog\/wp-json\/wp\/v2\/assunto?post=16671"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}